Solve for the measure of < 3

Ling listed all of the factors of a mystery number: 1,2,4,8,16,32 what is the mystery number?

Raj encoded a secret phrase using matrix multiplication. using a = 1, b = 2, c = 3, and so on, he multiplied the clear text code for each letter by the matrix to get a matrix that represents the encoded text. the matrix representing the encoded text is . what is the secret phrase? determine the location of spaces after you decode the text. yummy is the corn the tomato is red the corn is yummy red is the tomato

How many sides does a regular polygon have if each exterior angle measure is 45 degrees explain your answer, i really don't understand this.